Disk sharpener



Dec. 13, 1960 A. J. NANNINGA DISK SHARPENER 2 Sheets-Sheet 1 Filed March 6, 1959 AA/A/A /v/v /'/ve A INV'ENTOR ATTORNEYS.

Dec. 13, NANNINGA DISK SHARPENER Filed March 6, 1959 2 Sheets-Sheet 2 IIIII'4 'IIIIIIIIIIIIIIIIIIIIII INVENTOR BY I I I I ATTORNEYS United States Patent DISK SHARPENER Arnold J. Nanninga, Box 231, Leonardville, Kans.

Filed Mar. 6, 1959, Set. No. 797,663

1 Claim. (CI. 76-85) This invention relates to disk sharpeners, and more particularly to a portable disk sharpener that can be used for sharpening harrow disks on the job, thus avoiding the necessity and waste of time required to move the harrow to a Work shop or other place for sharpening its disks.

An object of this invention is the provision of a disk sharpener that does not require the disk harrow to be disassembled when it becomes necessary to sharpen the disks thereof.

Another object of this invention is the provision of a disk sharpener that is self cleaning in its operation.

Still another object of this invention is the provision of a disk sharpener that requires little skill to set up and operate, has few moving parts, is light in Weight and requires little space for storage when not in use.

Other and further objects and advantages of this disk sharpener will be hereinafter described and the novel features defined in the appended claim.

Referring to the drawings:

Figure 1 is a plan view of this invention showing part of a disk ready to be sharpened.

Fig. 2 is a side elevational view of this invention.

Fig. 3 is a sectional View taken substantially along line 3-3 of Fig. 1 as viewed in the direction indicated by the arrows.

Fig. 4 is a view taken substantially along line 44 of Fig. 2 as viewed in the direction indicated by the arrows, the disk having been omitted.

Fig. 5 is a sectional view taken substantially along line 5-5 of Fig. 4 as viewed in the direction indicated by the arrows.

Fig. 6 is a fragmentary detail of this invention.

Fig. 7 is a fragmentary plan view of this invention showing the sharpening tool in place, and ready for sharpening the edge of a disk.

Fig. 8 is a perspective view of a conventional cutolf bit.

Fig. 9 is a perspective view of a conventional sharpening bit.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Having reference now to the drawings in detail, and in particular to Figs. 1 and 2, there is indicated by the reference character 10 a tool holder secured to the top of the supporting rod 11 which is held in vertical tube 12 by means of set screw 13. The tool holder 10 is a rectangular block having an opening 14 in one end and directly over its supporting rod 11, the other end of which terminates in an elongated handle 15. A bar 16 is swingably mounted on the top of, and normally perpendicular to holder 10, as is clearly shown in Fig. 1 of the drawings. A handle 17 is secured to the outer end of bar 16, while a carbide tip holding tool 18 in the form of a lip which is substantially Wide and curved in the arc of a circle is secured to its other end. This construction of the carbide holding tip is such that it will be self cleaning and consequently maintained clean at all times, thereby avoiding an irregular edge being formed on the disk being sharpened, due to the accumulation of dirt and rust on the blade. Two difierent types of carbide tip tool bits go with this shaper; one, a cutting bit 19 which is shown in place within holder 10 and secured by set screw 10' as shown in Fig. 1, while the other tool bit 20 is for sharpening a disk and is shown in use in Fig. 7.

A flat circular base member 21, having a central depending point 22 is secured to the lower end of vertical tube 12, thus giw'ng rigidity to the tool while in use, and since it is customary to position the tool on a block of wood, the point will pierce the block of wood, holding the tool against shifting.

To use this disk shaper, it is only necessary to set it with the end of whatever tool bit is to be used, against the edge of disk D, and press the two handles 15 and 17 together. The disk D is rotated at approximately one hundred r.p.m. by means of a belt 24 on pulley 25, this pulley being secured to hub 26 of disk D. The other end of belt 24 is of course on a pulley on the power takeoff of a tractor or similar source of power, not shown.

It will be obvious to those experienced in the art that the rotary action of the steel disk D against the carbide tip tool bits will automatically clean the edge of disk D which is one of the objects of this invention.

This described operation is similar to other operations of similar tools used by those experienced in the art of sharpening similar blades.

From the foregoing it will now be seen that there is herein provided a novel disk shaper which accomplishes all of the objects of this invention, and others.

As many embodiments may be made of this inventive concept, and as many modifications may be made in the embodiment hereinbefore shown and described, it will be understood that all matter herein is to be interpreted merely as illustrative, and not in a limiting sense.

I claim:

A device for sharpening the mounted disks of a barrow during rotation of said disks, comprising a vertically adjustable stand, a wide horizontal tool holder pivotally mounted on the upper end of said stand, said tool holder having a rectangular enlargement formed with an opening having rectangular walls extending transversely therethrough in which a rectangular shank of a bit is removably secured, a wide bar pivotally connected with said wide horizontal tool holder, disposed at right angles with respect to said tool holder, a carbide tip holding member curved in the arc of a circle, secured at one of its ends to one end of said wide bar, the other end of said carbide tip holding member being wide and transversely curved, conforming to the curved surface of a disk harrow, a handle on one end of said wide horizontal tool holder, a handle on one end of said carbide tip holder, said handles being pivotally connected, and said handles adapted to effect the clamping of said bit and carbide tip holding member with respect to the edge of the disk being sharpened.

References Cited in the file of this patent UNITED STATES PATENTS 558,922 Armstrong Apr. 28, 1896 650,158 Stubcake May 22, 1900 1,574,812 Green et al. Mar. 2, 1926 1,625,199 Farmer Apr. 19, 1927 2,126,632 Harth Aug. 9, 1938 2,567,868 Bodge Sept. 11, 1951 FOREIGN PATENTS 158,472 Australia Aug. 25, 1954 

